PMMA表面包覆LaNi_(5)合金粉末的储氢性能  

Hydrogen storage properties of PMMA-coated LaNi_(5) alloy powders

作　　者：李珂 高云鹤 黄通文 周承商[1] LI Ke;GAO Yunhe;HUANG Tongwen;ZHOU Chengshang(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2022年第6期595-600,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51704336);中南大学创新驱动计划资助项目(2020CX025)。

摘　　要：LaNi_(5)储氢合金粉末易氧化,严重影响其储氢性能。本文采用溶液浸渍法将聚甲基丙烯酸甲酯(poly methyl meth acrylate,PMMA)对LaNi_(5)合金粉末进行表面包覆改性,研究粉末的微观形貌、储氢性能和抗氧化性能。结果表明,空气氧化后,PMMA包覆LaNi_(5)合金的储氢量保持在1.29%(质量分数),而LaNi_(5)合金的储氢量仅为1.15%。对比未包覆的LaNi_(5)合金,PMMA包覆LaNi_(5)合金在空气氧化后仍保持较好的吸放氢动力学性能和储氢量,且具备良好的循环稳定性。因此,PMMA包覆LaNi_(5)合金可减缓合金在空气中的氧化反应,改善合金的抗氧化性能,有利于合金的应用和储氢安全性。LaNi_(5)hydrogen storage alloy powders are easy to be oxidized,seriously affecting the hydrogen storage properties of La Ni5alloy.In this paper,PMMA (poly methyl meth acrylate) was used to modify the surface of LaNi_(5)alloy by the solution impregnation method.The micrmorphology,hydrogen storage properties,and oxidation resistance of LaNi_(5)alloy were investigated.The results show that the hydrogen storage capacity of air-oxidated PMMA-coated LaNi_(5)alloy after oxidation is maintained at 1.29%,while that of LaNi_(5)alloy decreases to 1.15%(mass fraction,%,the same below).Compared with the uncoated LaNi_(5)alloy,the dehydrogenation and hydrogenation kinetic and hydrogen storage capacity of PMMA-coated LaNi_(5)alloy after air-exposure are well maintained,and the PMMA-coated LaNi_(5)alloy possesses good cycling stability.Therefore,PMMA-coated LaNi_(5)alloy can mitigate the oxidation reaction of the alloy and improve the oxidation resistance of the alloy.It is beneficial for alloy applications and hydrogen storage safety.

关 键 词：LaNi_(5)合金 抗氧化性能 PMMA 包覆 合金粉末 

分 类 号：TG139.7[一般工业技术—材料科学与工程]